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LM324MTX Equivalent & Substitute Parts
Part Overview
The LM324MTX is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit device in a 14-TSSOP surface mount package. This component is classified as obsolete, indicating discontinuation from active production. The LM324MTX operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -40°C to 85°C, making it suitable for general analog signal processing applications requiring low-cost amplification solutions.
Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production runs and system maintenance.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Gain Bandwidth Product | 1 | MHz |
| Slew Rate | 0.3 | V/µs |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 1 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package / Case | 14-TSSOP (0.173", 4.40mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM324MTX is determined by strict adherence to the following electrical and mechanical parameters:
Critical Matching Parameters:
- Package type: 14-TSSOP surface mount configuration
- Number of circuits: 4 operational amplifiers per device
- Gain bandwidth product: 1 MHz minimum
- Supply voltage range: 3V to 32V minimum span
- Current output per channel: 40 mA minimum
- Mounting type: Surface mount
Acceptable Variation Parameters:
- Slew rate: Values equal to or greater than 0.3V/µs
- Input bias current: Values equal to or less than 90 nA
- Input offset voltage: Values equal to or less than 3 mV
- Operating temperature range: May extend beyond the original -40°C to 85°C specification
- Product status: Active or Last Time Buy status preferred over obsolete
Substitute parts are grouped into two categories: direct functional equivalents (LM324 base product number variants) and compatible alternatives (LM224 and LM2902 base product numbers) that meet all critical parameters while potentially offering enhanced specifications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Gain Bandwidth (MHz) | Slew Rate (V/µs) | Input Bias (nA) | Input Offset (mV) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LM324MTX | Rohm Semiconductor | Obsolete | 1 | 0.3 | 20 | 1 | 40 | 3 | 32 | -40 to 85 | 14-TSSOP |
| LM324DTBR2G | onsemi | Active | 1 | — | 90 | 2 | 40 | 3 | 32 | 0 to 70 | 14-TSSOP |
| LM224APT | STMicroelectronics | Active | 1.3 | 0.4 | 20 | 2 | 40 | 3 | 30 | -40 to 105 | 14-TSSOP |
| LM224DTBR2G | onsemi | Active | 1 | — | 90 | 2 | 40 | 3 | 32 | -25 to 85 | 14-TSSOP |
| LM224PT | STMicroelectronics | Active | 1.3 | 0.4 | 20 | 2 | 40 | 3 | 30 | -40 to 105 | 14-TSSOP |
| LM2902AWYPT | STMicroelectronics | Active | 1.3 | 0.4 | 20 | 2 | 40 | 3 | 30 | -40 to 125 | 14-TSSOP |
| LM2902DTBR2G | onsemi | Active | 1 | — | 90 | 2 | 40 | 3 | 32 | -40 to 105 | 14-TSSOP |
| LM2902KAVQPWR | Texas Instruments | Active | 1.2 | 0.5 | 20 | 3 | 30 | 3 | 30 | -40 to 125 | 14-TSSOP |
| LM2902KAVQPWRG4Q1 | Texas Instruments | Last Time Buy | 1.2 | 0.5 | 20 | 3 | 60 | 3 | 32 | -40 to 125 | 14-TSSOP |
| LM2902KAVQPWRQ1 | Texas Instruments | Active | 1.2 | 0.5 | 20 | 3 | 60 | 3 | 32 | -40 to 125 | 14-TSSOP |
| LM2902KVQPWR | Rohm Semiconductor | Not For New Designs | 1.2 | 0.3 | 20 | 3 | 30 | 3 | 26 | -40 to 125 | 14-TSSOP |
Engineering Selection Recommendations
Direct LM324 Equivalents (Preferred for Pin-Compatible Replacement):
LM324DTBR2G (onsemi) is the primary direct equivalent, offering identical gain bandwidth product and supply voltage range with active product status. This part maintains full functional compatibility with the LM324MTX while providing superior availability through onsemi's active manufacturing status.
Enhanced Performance Alternatives (LM224 Series):
LM224APT and LM224PT (STMicroelectronics) provide enhanced specifications including 1.3 MHz gain bandwidth product and 0.4V/µs slew rate, with extended operating temperature range to 105°C. These parts are suitable for applications requiring improved frequency response while maintaining the 4-circuit configuration and 14-TSSOP package.
LM224DTBR2G (onsemi) offers the same package and circuit count with active status, though with reduced maximum supply voltage (32V versus 30V for STMicroelectronics variants).
Automotive-Grade Alternatives (LM2902 Series):
LM2902KAVQPWRQ1 (Texas Instruments) provides automotive-grade qualification (AEC-Q100) with extended temperature range to 125°C and enhanced output current capability (60 mA per channel). This part is suitable for applications requiring automotive-grade reliability and higher output drive capability.
LM2902AWYPT (STMicroelectronics) offers similar automotive-grade specifications with push-pull output configuration and extended temperature range.
Selection Criteria by Application:
For direct replacement in existing designs: Select LM324DTBR2G.
For enhanced performance requirements: Select LM224APT or LM224PT.
For automotive or extended temperature applications: Select LM2902KAVQPWRQ1 or LM2902AWYPT.
All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage procedures.
Frequently Asked Questions (FAQ)
Q: Can LM324DTBR2G directly replace LM324MTX in existing circuit designs?
A: Yes. LM324DTBR2G maintains identical package configuration (14-TSSOP), circuit count (4), gain bandwidth product (1 MHz), and supply voltage range (3V to 32V). Pin-to-pin compatibility is assured. The primary difference is operating temperature range (0°C to 70°C versus -40°C to 85°C), which may require thermal evaluation for applications operating below 0°C or above 70°C.
Q: What is the difference between LM224 and LM2902 series alternatives?
A: LM224 series provides enhanced gain bandwidth product (1.3 MHz) and slew rate (0.4V/µs) compared to the original LM324MTX specification. LM2902 series offers automotive-grade qualification (AEC-Q100) with extended temperature range to 125°C and higher output current capability in certain variants. Both maintain the 4-circuit, 14-TSSOP configuration.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements equivalent to the original LM324MTX.
Q: What is the significance of "Last Time Buy" status for LM2902KAVQPWRG4Q1?
A: Last Time Buy status indicates that the manufacturer has announced discontinuation of this part number. While currently available, procurement should prioritize active status alternatives such as LM2902KAVQPWRQ1 for long-term design continuity.
Q: Can I use LM2902KAVQPWR in applications requiring the full 32V supply voltage?
A: No. LM2902KVQPWR (Rohm Semiconductor variant) has a maximum supply voltage of 26V, which is below the LM324MTX specification of 32V. For applications requiring 32V operation, select LM324DTBR2G, LM224DTBR2G, or LM2902KAVQPWRQ1.
Q: What packaging options are available for these substitute parts?
A: All substitute parts are available in 14-TSSOP surface mount package configuration. Packaging formats vary by manufacturer and part number, including Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options. Verify specific packaging availability with your component supplier.
Q: Is the input bias current difference between LM324MTX (20 nA) and LM324DTBR2G (90 nA) significant?
A: The 70 nA difference represents a 4.5x increase in input bias current. For applications with high-impedance input sources or precision transimpedance configurations, this difference may require circuit redesign. For general-purpose applications with moderate impedance levels, this difference is typically acceptable.
Q: Which substitute part offers the best thermal performance?
A: LM2902AWYPT and LM2902KAVQPWRQ1 both support operating temperatures to 125°C, providing the widest thermal operating range. These parts are recommended for applications requiring extended high-temperature operation.
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